Can't send MMS message to an Android phone
For some reason I can't send any MMS message to an Android phone. I can send them to myself from the Mac and from my iPhone, but not to another Android user. Having cellular data turned on is not the issue, since it doesn't work even with that on, and it shouldn't require that anyway; Wi-Fi should work.
T-Mobile says it should work, but with cellular data turned on, not Wi-Fi; but as I proved to them that doesn't make any difference in the result, they seem to be out of ideas.
Why is it so hard to send MMS to Android phones when it works perfectly fine for iPhones, and how can this problem be solved?
iPhone 4S